<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="../css/reset.css">
    <style>
        .judgeWrapper {
            width: 600px;
            margin: 50px auto;
        }

        .judgeWrapper .judgeBox {
            position: relative;
        }

        .judgeWrapper .judgeBox img {
            width: 100%;
        }

        .judgeWrapper .judgeBox .boxA,
        .judgeWrapper .judgeBox .boxB {
            width: 50px;
            height: 50px;
            background-color: #fff;
            position: absolute;
        }

        .judgeWrapper .judgeBox .boxA {
            left: 0;
            top: 100px;
            background: url(../images/bg.png) no-repeat -350px -100px / 600px auto;
            /* background-size: 600px auto; */
            z-index: 9;
        }

        .judgeWrapper .judgeBox .boxB {
            left: 350px;
            top: 100px;
        }

        .judgeWrapper .slideBar {
            width: 100%;
            height: 50px;
            margin-top: 10px;
            border-radius: 25px;
            background-color: grey;
            position: relative;
        }

        .judgeWrapper .slideBar .ball {
            width: 50px;
            height: 50px;
            background-color: #6ff;
            border-radius: 50%;
            position: absolute;
            left: 0;
            top: 0;
        }
    </style>
</head>

<body>
    <!-- .judge-wrapper>(.judgeBox>.boxA+.boxB)+.slideBar>.ball -->
    <div class="judgeWrapper">
        <div class="judgeBox">
            <img src="../images/bg.png" alt="">
            <div class="boxA"></div>
            <div class="boxB"></div>
        </div>
        <div class="slideBar">
            <div class="ball"></div>
        </div>
    </div>
</body>

</html>